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. 2009 Jun 8;4(6):e5836. doi: 10.1371/journal.pone.0005836

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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(A) Shows ubiquinone bound in the Q_i pocket to surrounding cytb residues. A water molecule involved in H-bonding is highlighted in red. The reduction of ubiquinone proceeds from (B) to (D) with the vacation of ubiquinol shown in (E). (F) Shows the vacant Q_i site with replenished water molecules (red) that replace the H⁺ used in the reaction. The cycle continues in (G) with another ubiquinone entering the binding site and the process starts again. The figure was adapted from Kolling et al. [38] and Crofts [36].